Stream.generate()
Description
generate(Supplier<T> s) uses Supplier to generate an infinite sequential unordered stream.
Example
The following code prints five random numbers.
import java.util.stream.Stream;
// w ww .j a v a2s. co m
public class Main {
public static void main(String[] args) {
Stream.generate(Math::random)
.limit(5)
.forEach(System.out::println);
}
}
The code above generates the following result.
Example 2
To generate a stream in which the next element is generated based on the previous one, you will need to use a Supplier that stores the last generated element.
The following code keeps the last value in a static varaible.
import java.util.stream.Stream;
/* ww w. j a v a 2s. c om*/
public class Main {
public static void main(String[] args) {
Stream.generate(Main::next)
.limit(5)
.forEach(System.out::println);
}
static int i=0;
private static int next(){
i++;
return i;
}
}
The code above generates the following result.
